feat: allow native keyboard on iPad and desktop

[my-claude-utils]

Summary

Resolves #24 — our first community issue! 🎉

• Native keyboard toggle in Skin Studio, visible only on iPad/desktop (screen width >= 768px)
• When enabled: xterm.js textarea is restored, terminal.onData wires physical keystrokes to the PTY, on-screen keyboard and context strip are hidden
• When disabled (default): existing behavior unchanged, on-screen keyboard works as before
• CLI token display: one-time bootstrap token now shown in plain text in npx clsh-dev output for easy copy-paste on desktop
• Auth screen: label updated from "Bootstrap Token" to "One-Time Token" for clarity

Files changed

File	Change
packages/web/src/hooks/useNativeKeyboard.ts	New hook — localStorage-backed toggle
packages/web/src/hooks/useTerminal.ts	Textarea suppression now reactive to nativeKeyboard
packages/web/src/components/TerminalView.tsx	Conditional onData handler + keyboard visibility
packages/web/src/components/SkinStudio.tsx	Toggle UI with iOS-style switch
packages/web/src/App.tsx	Wire hook through to components
packages/web/src/lib/types.ts	Props updated
packages/agent/src/tunnel.ts	Print token in CLI output
packages/web/src/components/AuthScreen.tsx	"One-Time Token" label

Test plan

• Desktop (>= 768px): Toggle visible in Skin Studio, enables physical keyboard input
• Phone (< 768px): Toggle NOT visible, on-screen keyboard works as before
• iPad: Toggle visible, physical keyboard works when external keyboard connected
• npx clsh-dev terminal output shows token in plain text
• Token is single-use and expires after 5 minutes (no security regression)
• Settings persist across page reloads (localStorage)